Ruf isn't starting Monday's game against the Diamondbacks, Alex Pavlovic of NBC Sports Bay Area reports.
Ruf went 1-for-5 with a run and two strikeouts during Sunday's series finale against the Padres, and he'll be out of the lineup for the second time in the last three games. Brandon Belt is serving as the designated hitter while Luis Gonzalez enters the lineup in right field.